Hand motor with manually operated brake



April 1948- w. G. B-ARCROFT ET AL I ,32

HAND MOTOR WITH MANUALLY OPERATED BRAKE Filed May 29, 1945 1 2 Sheets-Shee,t 1

swam m5 W/lll/W 6'. B/WC'IYOFr flABEL L. NAAS April 1948' w. G. BARCROFT ET AL 2,440,322

HAND MOTOR WITH MANUALLY OPERATED BRAKE Filed May 29, 1945 2 Sheets-Sheet 2 NIMIIIIH y l "Hi" of' X IH 19 Ill "H i In Patented Apr. 27, 1948 m epics HAND llrIOTOR VJ 1TH- MANUALLY' OPERATED BRAKE William. -G..Barc1'oft andMabel L. Mamas,

Boulder, Colo.-

Applieation May29, 1945, SerialNo. 596,552

3 Claims.

Thiswinvention relates to, an improved kitchen" utensil and it is, one object ofthe inventionto provide a-utensil. in which material may be cooked and the material stirred and its ingredients thoroughly; mixed; before, and during cooking. It will thus be seen that the ingredients of-lthe material may be thoroughly intermingled and keptzin motion, and thus prevented from being scorched 1 or burnt :during ;cooking;

Another object. of the invention is ,to' provide animplement includinga container anda cover therefore-carrying a'motor which is.-firm1y-securedr-uponrthe upper surface of the cover and has its shaft extending downwardly through the coverand carrying an agitator which is so shaped andisoxlocated within the-oontainer that contents thereofwill be thoroughly agitated. when theqagitator :is, in operation. v

Another; objectof the invention-is. to provide an agitator so connected withgthe lowerendportion ofathe motorshait thatuitrwillbe detachably heldozin place i thereon and ;be easily. removable but not liable :to: accidentally sliploose.

Another object of the invention is, to; provide the agitator." or beater with 1 blades of special formation;,.onebeing :larger than the other and a. the smaller one having portions disposed at such;

an. angle that they will: cause-material. to besslowly movedwupward-lyi from: the: bottom: of: the vcon-x tainer andthus prevented: fromtbeing scorched.

Another; object of the invention-is to vprovidethe' motor--with an upstanding handle by rneans of wh-ichthe covercarrying the motor' may 1 be lifted from the container, there. being also pro-;

vided-rmeans-for controlling the; speed. of themotor;

Anotherobject of the invention sis to provide speedcontrolling mechanism including a lever carriedibythe motor: and; so. disposed that the thumbqofa a: hand. grasping the handle may be readilyapplied/to the lever and downward pressure 5, applied to: create frictional binding and check: rotation of the-motor shaft;

Another object :of thee-invention isto provide the-speedcontrolling mechanism; with a set screw disposed-oven theqlever and having-its lower end engaging-:the lever soithat by-adjustingthe screw the.,lever maybeshifted to adjusted position where it disposes the screw .in position. for applying.p redetermined pressure upon the-upper end of .thermotori shaft.

In the accompanying drawings:

Fig. 1 is a View showingtheimproved cooker andsmixer partially inv side elevation: and partially in verticalsectionr Fig. 2 is .a view on the line-2--2 of Fig-,: 1.

Fig. 3 is a fragmentary sectional View ofthe speed controlling. mechanism.

Fig. l is a vieW- on an'enlarged scale showing the agitatonthe motor, andnthe cover "partially; in side elevation-and partially; in vertical section: Fig."5 is azviewon the line :51-5-ofFig; e, loolring down on the agitator.

Fig. '7 is a perspective viewshowingthe cou pling'ior detachably connecting the agitator with;

the motor shaft.

This improved cooker. and stirrer includes and disposed within; the container pi, and .speed controlling 1 mechanism 8 associated: with the handle -and the upper, end of the motor shaft so that a; person grasping the handle may adjust theymechanism to regulate the speed at which:

the motor shaft will rotate:v

The container-l is ofconventional formation and has :a handle 9 by means of whichit may be lifted. :when placing: it upon a stove .or removed therefrom: The upper portion Iii of -the' con-v tainer hasbeen shownconstricted and terminates in a-mouth' or neck H .for engagement by-the cover 2 and, since thedepending portion l2tof the cover fits within. the neck I l, the cover-will be prevented'fromshifting transversely out'of It will be -understood that this merely-illustrates one.

place--whenaapplied to the container;

specific form. of container and cover and that the invention is not restricted-to the particular for-mot :container and cover illustrated;

The motor :3 is of conventional: construction and v has -thelower end portion of its shaft! project? ing downwardly through an opening at thecenter of the cover andits upper end portion'projecting' upwardly for engagement by the speed controlling: mechanism: Asleeve or coupling l3 fits about the lower portion of the motor shaft where it iszsecured by-va-pin it formed from a wire strand having aportion l5 bentabout the sleeve to hold the pin in place and prevent it from slip ping outv of' the registering openings formed transversely through the sleeve andmotor-shaft.

A .pin Iii passes diametricallythrough the lower end portion of the. sleeve "below the lower: end of the-motor shaft, as shown in Fig." 4, and this pin is fixedly carried by the sleeve and is of such 7 length that its-ends project from: opposite sides- 3 of the sleeve. Therefore, the protruding ends of the pin it may engage in the bayonet slots l'l formed in the head or socket l8 of the agitator and detachably hold the agitator in engagement with the coupling sleeve.

The agitator has beaters l9 and 29 formed from strips of sheet metal which are each bent to form a lower bridge lSa or 20a and arcuate arms I91) or 2% extending upwardly therefrom with their upper end portions brought toward each other and then bent upwardly to form attaching portions or shanks [90 or 200 which are welded or otherwise firmly secured against the socket, as clearly shown in Figs. 4 and 6. The beater I9 is smaller than the beater 20 and its bridge portion is bent, at opposite sides of the point at which it is secured in crossing relation to the bridge of the beater 26 by the head 2i of the vertically extending rod 22, to form transversely pitched blades 23 which serve to impart upward movement to material at the bottom of the container and thus eliminate any danger of some of the material remaining at the bottom of the container and becoming scorched. The upper end of the rod 22 is mounted through the center of the socket It to firmly hold the rod in place and prevent downward distortion of the heaters and it should be noted that the lower portion lila of the socket is solid and substantially thicker than its upstanding annular wall to provide a good mounting [for the rod and upper ends of the heaters. This is clearly shown in Fig. 4.

During operation of the mixer, the speed at which the motor shaft turns must be regulated and, in order to do so, the person using the cooker adjusts the speed controlling mechanism 8. This mechanism includes a lever 24 which is formed from a strip of resilient sheet metal and has one end welded against the upper end of the casing of the motor 3. The lever extends diametrically of the motor and across the upper end of the motor shaft 1 and, at its free end, is formed with a downwardly depressed concavoconvex head or thumb engaging member 25. The lever extends under a cross bar or bridge 26 carried by and extending between the arms 21 of the handle 5, the arms being formed of metal and having their lower end portions bent inwardly and secured against the top of the motor casing by fasteners 28. A bearing 29 which is internally threaded, is formed intermediate the length of the bridge 26 and through this bearing passes a screw 30 which has a rounded head 3! at its lower end for engaging the upper surface of the lever. At its upper end, the screw carries a knob 32 formed of insulation and located under the wooden hand grip 33 of the handle in such position that the fingers of a hand grasping the hand grip may engage the knob and thereby turn the screw for adjusting the screw vertically. The thumb engaging free end portion 25 of the lever is located at one side of the bljdge in such position that when a person is grasping the hand grip, his thumb may be moved downwardly and apply pressure to 'flex the lever downwardly and apply pressure to the upper end of the motor shaft. As the lever engages the upper end of the motor shaft, frictional braking action is created and the speed at which the motor shaft rotates will be reduced. By gradually increasing the pressure upon the lever, the speed of the motor shaft may be progressively reduced until the desired speed is attained. The screw 38 will then be screwed downwardly until the lower end engages the upper face of the lever and holds the lever against upward movement. If desired, downward movement of the lever may be efiected solely by means of the screw or, if it is desired to have intermittent increases and reductions in the speed of the motor shaft, the lever may be alternately depressed and raised by action of the thumb resting upon the free end of the lever.

As the motor shaft turns the agitator will be turned with it and when the handle is grasped and upward pull exerted to remove the cover from the container the agitator will be removed therewith. If the cover and the agitator are to be only temporarily removed, the marginal edge of the cover and the hand grip 33 may be set at rest upon a table and the handle, by resting upon the table, will prevent the cover from rolling to the edge of the table and dropping upon the floor. If the cooking operation is finished, or use of the mixer is no longer desired, the socket will be disengaged from the pin 16 and the socket slid out of engagement with the sleeve. The agitator or mixer may then be thoroughly cleaned and put away.

Having thus described the invention, what is claimed is:

i. In a device of the character described, a support, a motor on said support including a ver tical shaft having protruding upper and lower portions, a handle extending upwardly from said motor and having side arms mounted upon the motor and a hand grip between upper portions or" the side arms, a cross bar extending horizontally between the side arms and spaced from the motor and the hand grip, a yieldable lever carried by said motor and extending transversely of. the motor under the cross bar and across the upper end of the motor shaft with a free end protruding from one side of the cross bar in position for engagement by the thumb of a hand grasping the hand grip whereby the lever may be depressed and pressure applied to the motor shaft to frictionally check the speed at which the shaft rotates, and means carried by the cross bar for forcing the lever downwardly and holding the lever in position for frictionally engaging the shaft.

2. In a'deviceof the character described, a support, a motor on said support including a vertical shaft having protruding upper and lower portions, a handle extending upwardly from said motor and having side arms fixed to the motor and a hand grip extending horizontally between upper portions of the side arms, a horizontal cross bar carried by the side arms and spaced from the motor and the hand grip, a yieldable lever carried by said motor and extending diametrically of the motor and under the cross bar transversely thereof and across the upper end of the motor shaft and having a free end protruding from one side of the cross bar in position for engagement by the thumb of a hand grasping the hand grip whereby the lever may be depressed by the thumb and pressure applied to the motor shaft to check the speed at which the shaft rotates, and a screw threaded vertically through the cross bar and having a turning knob at its upper end and a head at its lower end for engaging the upper face of the lever adjacent the free end thereof and shifting the lever downwardly into engagement with the shaft when the screw is turned in a direction to shift it downwardly through the cross bar.

3. In a device of the character described, a support, a motor on said support including a vertical shaft having protruding upper and lower portions, a handle extending upwardly from said motor and having a grip extending diametrically of the motor, a lever carried by said motor and extending transversely of the handle under the hand grip and across the upper end of said shaft with its free end projecting from a side of the handle in position to be depressed by the thumb of a hand grasping the hand grip, and a screw carried by said handle for engaging said lever adjacent'the free end thereof and applying downward pressure to the lever and shifting the lever downwardly into engagement with the upper end of the shaft for frictionally resisting rotation of the shaft.

WILLIAM G. BARCROF'I. MABEL L. MAAS.

rmrmmnons orrnn The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,085,858 Fulton Feb. 3, 1914 1,359,208 Viers Nov. 16, 1920 1,536,203 Frydenlund May 5, 1925 1,710,417 Goodall Apr. 23, 1929 2,048,455 Knapp July 21, 1936 2,250,142 Umstead. July 22, 1941 

